Light beam purification method and solid laser device based on digital holography technology

Abstract

The invention provides a light beam purification method and solid laser device based on the digital holography technology. The solid laser device comprises a first polarization beam splitter prism, a plurality of laser amplifier stages, a second polarization beam splitter prism, a CCD and a spatial light modulator, wherein the first polarization beam splitter prism reflects a beacon beam and outputs reflected light of the beacon beam, the laser amplifier stages amplify the reflected light of the beacon beam with phase distortion information and output the amplified beam with the phase distortion information, the second polarization beam splitter prism is used for reflecting the amplified beam with the phase distortion information and outputting the reflected beam, the CCD is used for projecting the reflected beam and reference light and conducting interference on the reflected beam and the reference light so as to obtain a digital holographic image, the spatial light modulator outputs local oscillator light with the conjugation phase distribution characteristic according to the digital holographic image under the irradiation of emergent light, the second polarization beam splitter prism is used for conducting transmission on the local oscillator light with the conjugation phase distribution characteristic, the laser amplifier stages are used for amplifying the local conjugation light where transmission is conducted through the second polarization beam splitter prism and outputting the amplified light, and the first polarization beam splitter prism is used for conducting transmission on the amplified light and then outputting the amplified light. Phase control does not need to be conducted on the intense laser wavefront, thermal distortion and thermal damage of optical elements are avoided, and the light beam purification method and the solid laser device are suitable for being applied to high-power solid laser devices.

Description

technical field [0001] The present invention relates to the technical field of lasers, in particular to the beam purification technology of solid-state lasers, and specifically to a beam purification method based on digital holography technology and a solid-state laser. Background technique [0002] In recent years, high-brightness solid-state laser technology has made major breakthroughs. It has many advantages such as compact structure, small size, electric drive, no pollution, low cost, and strong continuous emission capability. It is widely used in industrial processing, national defense and scientific research. There are very wide application requirements. [0003] At present, the power level of high-beam quality solid-state lasers with single-gain modules is on the order of several kilowatts. Even if the main oscillation-power amplification structure technology is adopted, the average power of solid-state laser links with single-aperture near-diffraction-limit output c...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the laser wavefront correction technology in the prior art, deformable mirrors and tilted mirrors are used. Due to the larger pixels of deformable mirrors and tilted mirrors, the resolution is low, and the fill factor is low, the correction effect on high-order wavefront distortion is relatively poor. To solve the problem of poor quality, the present invention provides a beam purification method based on digital holography technology and a solid-state laser, using a polarization beam splitting prism and multiple laser amplification stages to obtain the thermal lens effect of the laser medium and system errors in the laser amplification stage. The digital holographic image is distorted and recorded in the digital holographic image through the CCD, and then the digital holographic image is loaded on the spatial light modulator, and the conjugated reproduction light obtained by the irradiation of the outgoing light enters the amplification stage as the local oscillator light, and is amplified step by step to obtain a high High-quality laser output without phase control of strong laser wavefront, avoiding thermal distortion and thermal damage of optical components, suitable for applications in high-power laser systems

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